USB: EHCI, OHCI: handover changes

This patch (as887) changes the way ehci-hcd and ohci-hcd handle a loss
of VBUS power during suspend.  In order for the USB-persist facility
to work correctly, it is necessary for low- and full-speed devices
attached to a high-speed port to be handed back to the companion
controller during resume processing.

This entails three changes: adding code to ehci-hcd to perform the
handover, removing code from ohci-hcd to turn off ports during
root-hub reinit, and adding code to ohci-hcd to turn on ports during
PCI controller resume.  (Other bus glue resume methods for platforms
supporting high-speed controllers would need a similar change, if any
existed.)

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 99ab31e9778b..b5a7aa90209a 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -399,6 +399,8 @@ static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
                                 is_on ? SetPortFeature : ClearPortFeature,
                                 USB_PORT_FEAT_POWER,
                                 port--, NULL, 0);
+        /* Flush those writes */
+        ehci_readl(ehci, &ehci->regs->command);
         msleep(20);
 }